@nick13579 that really depends on your motors, so I can't answer with any authority. Lithium polymer battery packs tend to work well in general as long as they are charged up and supply a voltage in spec for the motors, and they usually provide plenty of current. You can get those at any place that sells radio-controlled (RC) hobby stuff. I'll also give the obligatory statement that LiPo batteries can be dangerous if not handled with care (YouTube can prove that to you), but as long as you are responsible with them, they don't bite.
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